Uniweld Type17-0 Weld/Braze Tip Proudly Made in the USA and 100% Flame Tested Can be used with acetylene, propane, MAP//Pro, and natural gas Capable of welding 5/64in of metal and brazing 1/2in of copper Fits the 71 handle or the WH550 handle Tip nut only requires hand tightening allowing for quick and easy changing of tips